A manufacturer of a gas additive claims that it improves gasmileage. A random sa

A manufacturer of a gas additive claims that it improves gasmileage. A random sample of 30 drivers tests this claim bydetermining their gas mileage for a full tank of gas that containsthe additive (X1) and for a full tank of gas that does not containthe additive (X2). The sample mean difference D-Bar equals 2.12miles (in favor of the additive) and the estimated standard errorequals 1.50 miles. (a) Using t- test the null hypothesis at the .01level of significance (b) Specify the p-value for this result._____________